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首页> 外文期刊>Marine ecology progress series >Tide and wind control of megalopal supply to estuarine crab populations on the Portuguese west coast
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Tide and wind control of megalopal supply to estuarine crab populations on the Portuguese west coast

机译：葡萄牙西海岸河口螃蟹种群巨供应的潮汐和风能控制

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摘要

Physical processes that force transport of planktonic larvae of invertebrates are responsible for some of the spatial and temporal variability in recruitment. We investigated the influence of tide- and wind-driven circulation on intra-year variability of megalopal supply to populations of the crab Carcinus maenas in 2 estuaries on the Portuguese west coast. Daily data on physical variables and on supply and settlement of megalopae were subjected to time series analysis and multiple regression techniques in order to identify periodicity in the variables as well as time lags between larval supply and physical variables. Relaxation of northerly winds, which favor upwelling, was associated with temperature increase and subtidal sea level rise at the coast, which are indicative of coastal convergence of the surface layer. Supply of megalopae to the estuaries, as measured with passive plankton nets, followed a fortnightly cycle with maximum larval supply at the time of maximum tidal amplitude. Supply was enhanced by southerly winds, with delays of 0 to -2 d. Settlement of megalopae on artificial settlement substrates deployed on the bottom was uncoupled to supply at both estuaries. Therefore, transport of C. maenas megalopae to the nearshore is accomplished by onshore advection following downwelling winds, and supply to the estuaries occurs by selective tidal stream transport. Involvement of internal waves and internal tidal bores cannot be be ruled out, but very particular periodicities of the generating mechanisms would have to be assumed to account for the observed time lags.
机译：迫使无脊椎动物浮游幼体运输的物理过程是造成募集时空变化的原因。我们调查了潮汐和风驱动环流对葡萄牙西海岸2个河口蟹Carcinus maenas种群的大鳍供应的年内变化的影响。为了确定变量的周期性以及幼虫供应和物理变量之间的时滞，对物理变量以及巨mega供应和沉降的每日数据进行了时间序列分析和多元回归技术。有利于上升流的北风的松弛与海岸的温度升高和潮下海平面升高有关，这表明表层沿海趋同。用无源浮游生物网测量的河口巨藻供应量，跟随两周的周期，在最大潮汐振幅时最大的幼体供应量。偏南风增强了供应，延迟了0至-2 d。部署在底部的人工沉降基质上的巨lop的沉降不耦合到两个河口。因此，梅花梭菌向近岸的运输是通过顺风向下的陆上平流来完成的，并且通过选择性的潮汐流的运输而向河口供应水。不能排除内部波浪和内部潮汐孔的影响，但是必须假定发电机构的非常特殊的周期来解决观测到的时滞。

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